NAZARENKO I. Increase of efficiency hybridisation in pigindustry by rotational change of the manufacturers.

The dissertation is devoted to study of efficiency of various variants two and threetypes of crossing for want of use of breeds, types and lines generically not similar, with use of the manufacturers of leading breeds: large black, Ukrainian meat, Moldavian meat type and specialized meat line of the Poltava selection. The crossing base unit pig of the large white breed with of the used parental forms assisted increase reproductive of qualities. More high level daily average growing and maximum growth rate had received from connection of the large white and Ukrainian meat breeds and threetypeslines hybridisation from pigs it cross and specialized meat line of the Poltava selection. Typicaly kind and tree-linear hybrids in comparison with pure family by animals had more high fodder qualities. By the highest meat qualities differed pig, both in two -, and in three-kindlinear crossing for want of use in qualities of the parental form of the Moldavian type. Developed and offered for introduction in commodit y exchange economies system of rotational crossings, that provides increase of productivity during several generations for want of organizations of reproduction base units herd for the account (invoice) younger pigs of the best associations, namely connection of the large white and Ukrainian meat breeds, and in the further acquisition base units of herds to conduct younger pigs it cross and to couple them with pig of the specialized meat line of the Poltava selection.